- added the ability to compile code with assertions that need exceptions even without exceptions - see the use of DOCTEST_CONFIG_NO_EXCEPTIONS_BUT_WITH_ALL_ASSERTS
- added clang 3.9 to build matrix

relates #44
diff --git a/.travis.yml b/.travis.yml
index 2619dc1..8eb7795 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -48,6 +48,7 @@
       - llvm-toolchain-precise-3.6
       - llvm-toolchain-precise-3.7
       - llvm-toolchain-precise-3.8
+      - llvm-toolchain-precise-3.9
       - llvm-toolchain-precise
 
 compiler: clang
@@ -164,6 +165,13 @@
           packages: ["clang-3.8", "valgrind", "g++-multilib", "libc6-dbg", "libc6-dbg:i386", "g++-6"]
           sources: *apt_sources
 
+    # Clang 3.9
+    - env: COMPILER=clang++-3.9 HAS_ASAN_64=true HAS_UBSAN_64=true
+      addons: &clang39
+        apt:
+          packages: ["clang-3.9", "valgrind", "g++-multilib", "libc6-dbg", "libc6-dbg:i386", "g++-6"]
+          sources: *apt_sources
+
     # Xcode 6.1 Clang
     - env: COMPILER=clang++
       os: osx